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One alloy contains silver and copper in the ratio of 5:1 and the other contains them in the ratio of 7:2 respectively. What weights of the two must be melted together, so as to make a 5 lb mass with 80% silver?

A.	1/0.9	B.	2/3.5
C.	1/2	D.	2/3

Answer and Explanation

Answer:2/3

Explanation:
Alloy1 silver=5,Copper = 1
Alloy2 silver=7,Copper = 2

Quantity of silver in alloy1=5/6
Quantity of silver in alloy2=7/9

Quantity of silver in Mixture=80/100=4/5

Proportion 1/45 : 1/30
The two alloys should be mixed in the ratio (1/45)/(1/30) = 2/3

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